I have some software for editing a very specialized piece of MIDI gear, and the software only runs on MacOS 9. I've kept around a behemoth PowerPC CPU solely for this purpose, but I recently purchased a svelte iBook G3 instead.

The tricky part is the iBook doesn't let me connect my serial MIDI interface. It only has USB ports.

This ancient software was written before USB, and I'm not sure it understands frameworks like FreeMIDI or OMS. You simply choose a numeric MIDI port number, and I have a hunch it's trying to find MIDI by looking on an old-school serial port.

Any recommendations on how to trick this software into using a USB-based MIDI interface?

yes, if it about an interface, the stealth serial to usb adapter should do it. (or cheap usb interface if that comes into question)

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"It is true that the "pre-emptive multitasking" advantage present in OS X can be illustrated by downloading CD-ROM ISOs and rendering chaos theory formulas while simultaneously instant messaging and posting on FaceBook what you ate... but in reality, what did you create?" - DieHard, random forum troll at macos9lives.com